Patent GB-945913-A (GB)
Title: Folding machine
IPC: B31B50/72
Filed: 1962-07-16
Abstract: 945,913. Making collapsed boxes. S. & S. CORRUGATED PAPER MACHINERY CO. Inc. July 16, 1962 [Aug. 21, 1961], No. 27287/62. Heading B5D. In a folding machine for forming flat collapsed tubular boxes from flat scored blanks of paper or corrugated board, and which has stop means for positioning each blank at the folding station and is adjustable for different sized blanks, the stop means is adjustably positioned on longitudinally extending bars connected to a parallel motion operating mechanism for raising and lowering the stop means into and out of the path of the blanks. Blanks are fed from a stack 22 beneath a gauge 25 to feed rolls 35-38. Rolls 35 and 38 are spring biased to accommodate blanks of different thickness. The upper rolls 37 are adjustable so that they lie just within the fold lines as defined by folding bars 39, 40 (Figs. 1 and 6). Further rolls 41, 42 carry each blank towards the folding mechanism where rolls 53 carry the blank into engagement with the stop means 101 mounted on bars 102 (Figs. 1 and 13). The blank is next folded by means of plates 60 mounted on arms 61 and operated by gearing in boxes 64. After folding, the stop means are lowered and a slat 90 carried by conveyer chains 91 engages the rear of the blank and moves it beneath a hold-down strip 92 adjustably supported in a bracket 93. Rolls 70, 71 above and below each folding bar 39, 40 prevent excessive flexing of the bars and also control the position of the blanks so that the folded edges of the blanks properly engage straightening rolls 75. These rolls are spaced apart slightly less than the width of a folded blank so that the blank is creased regularly at both sides. The blank then passes to recreasing rolls 76 (Fig. 1), and the leading edges of the folded over panels are engaged by a spring- loaded pivoted stop of hard rubber having a high co-efficient of friction which aligns the panels. Next, at a taping station, a strip of tape is applied longitudinally to bridge the free edges of the folded panels. Stop-bar motion (Fig. 13). Each stop-bar 102, carrying a stop 101 adjustably positioned thereon, is connected to two cranks 405, 406. Crank 405 is pivoted on a stationary shaft 407 and crank 406 is keyed to a rock-shaft 412. A tie-bar 409 connects the cranks and a spring 414 biases the parallel mechanism to one end position. A cam follower keyed to the shaft 412 rocks the bars 102 by means of the bar 409 and cranks 405, 406 so that the stops 101 are raised into the path of the blanks just before a blank is fed to the folding means. A hand-wheel is provided whereby the timing of the raising of the stops can be adjusted. Drive means.-A shaft 153 driven by a variable speed D.C. motor carries a sprocket 154 which pulls conveyer chains 91 on which are mounted the slats 90 engaging the blanks. Bevel gears 170, 171 connect a shaft 172 to the driven shaft 153 and through a coupling 201 a shaft 200 is driven. The parallel motion of the stop-bar is derived from transmission means 199 on a shaft 174. The folding mechanism is driven by a shaft 204 connected by bevel gears 202, 203 to the shaft 200. Gears 230- 233 provide a drive for shaft 234 which operates a kicker-bar 33 carrying spring kickers 33a. The feed rolls are driven by gears from the shaft 200. To prevent the blanks rebounding from the stops 101, a relatively large area 456 of contact is provided for the blanks to slide on at each side and an incline adjacent each stop also decelerates the blanks. U.S.A. Specification 2,622,493 is referred -to.